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首页> 外文期刊>International Journal of Aeroacoustics >Prediction of jet noise for realistic flow problems using large eddy simulation
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Prediction of jet noise for realistic flow problems using large eddy simulation

机译：使用大涡模拟预测现实流动问题中的射流噪声

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摘要

A systematic procedure is described to predict the noise emissions from realistic aero-propulsive jets. Large Eddy Simulation (LES) is used to compute the jet flowfield and coupled with the Ffowcs Williams and Hawkings (FW-H) equation for far-field noise predictions. A low-dissipation fifth-order upwind biased finite-volume reconstruction procedure is used along with selective fourth order inviscid flux blending. Higher order explicit time integrators are used for enhanced wave propagation. Also, non-contiguous block interfacing is employed to eliminate the traditional limitations of structured grid topologies for complex geometries. For simple jet configurations the LES/FW-H method is validated with University of Mississippi's National Center for Physical Acoustics (NCPA) experimental measurements. Four unique and more realistic applications are then shown. The first is a hot faceted jet with lobed corrugations, followed by an over-expanded military gas turbine engine exhaust with and without chevrons. Then a twin jet impinging on a jet blast deflector is shown, and lastly are two high aspect-ratio nozzles, one with and one without a bevel. The LES/FW-H methodology is shown to produce reasonable agreement with experimental measurements at modest grid resolutions. Details are discussed about the selected example problems highlighting the challenges associated with applying the tools to realistic geometries and jet configurations.
机译：描述了系统的程序，以预测现实的喷气发动机的噪声排放。大涡模拟（LES）用于计算射流流场，并与Ffowcs Williams和Hawkings（FW-H）方程相结合，用于远场噪声预测。低耗散的五阶迎风偏向有限体积重建程序与选择性的四阶无粘性通量混合一起使用。高阶显式时间积分器用于增强波的传播。同样，采用非连续的块接口以消除复杂几何结构的结构化网格拓扑的传统限制。对于简单的射流配置，LES / FW-H方法已通过密西西比大学的国家物理声学中心（NCPA）实验测量进行了验证。然后显示了四个独特且更实际的应用程序。第一个是带有凸起波纹的热面喷气机，其次是带有和不带有人字形的军用燃气涡轮发动机排气装置的过度膨胀。然后显示了一个双喷流，该双喷流撞击在喷射流偏转器上，最后是两个高纵横比喷嘴，一个带斜角，一个不带斜角。事实证明，LES / FW-H方法可以在适当的网格分辨率下与实验测量结果产生合理的一致性。讨论了有关选定示例问题的详细信息，突出了与将工具应用于实际几何形状和射流配置相关的挑战。

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